Is Iran a geo-political threat to Persian Gulf or are they just fanning flames?

Jane, Albert, Don and Jon review the perceived vs. actual threat of recent presupposed Iranian aggression toward the U.S. embassy in Badhdad. It is still unclear whether it was an Iranian based attack of Shia militia from Eastern Baghdad that launched a rocket toward the U.S. embassy.  If Iran is posing a legitimate threat, then the U.S. must reply with tthe least restrictive approach as to not disrupt the entire Middle East.  Is this war in the making or does our U.S. military have to prune their response in a consequential strategy to send a message to aggressors without causing instability in the relatively peaceful Iraqi capitol?